Wilsons primary and permanant dentition .pptx

Your teeth are part of your digestive system. They break down foods by crushing or cutting them before you swallow. Most humans have 32 teeth, although some have more and some have fewer. Enamel (the protective outer layer of your teeth) is the hardest substance in the human body.

Contents
Overview
Function
Anatomy
Conditions and Disorders
Care
Additional Common Questions

Care
Overview
Teeth types (incisors, canines, premolars, molars) and anatomy of a tooth.
Most adults have 32 permanent teeth, including eight incisors, four canines, eight premolars and 12 molars.
What are teeth?
Your teeth play a big role in digestion. They cut and crush foods, making them easier to swallow.

Though they look more like bones, teeth are actually ectodermal organs. Other ectodermal organs include your hair, skin and sweat glands.

How many teeth do humans have?
Most adults have 32 permanent teeth. But some people are born with missing teeth (hypodontia), and some people have extra teeth (hyperdontia).

Most children have 20 primary teeth that grow in (erupt) between the ages of 4 months old and 6 years old. These are baby teeth that’ll eventually fall out and make room for permanent adult teeth.

What are the four types of teeth?
We have different types of teeth, and each type serves an important purpose. There are four types of permanent teeth in humans:

Incisors.
Canines.
Premolars.
Molars.
Incisors
Your incisors are the most visible teeth in your mouth. Most people have four incisors on the upper jaw and four on the lower. These include your front two teeth and the teeth on either side of them.

Each incisor has a single narrow edge, which helps cut into food when you bite.

Canines
Canine teeth get their name because they resemble a dog’s fangs. They’re pointier than other types of teeth. Most people have four canine teeth — one in each quadrant (upper right, upper left, lower right, lower left).

Canine teeth help you tear into foods like meat and crunchy vegetables. Sometimes, people call canines “eye teeth” because of their position directly under your eyes.

Premolars
Also called bicuspids, premolars sit between your canines and your molars (the teeth in the back of your mouth).

Premolar teeth have features of both canines and molars. They help you tear, crush and grind food into smaller pieces.

Molars
Your molar teeth are in the very back of your mouth. Most of your chewing — about 90% — takes place here. Most adults have 12 molar teeth — three in each quadrant.

Molar teeth include wisdom teeth (third molars). So, if you’ve had your wisdom teeth removed, or if you were born without them, then you probably have eight molars altogether.

Because molars are your main chewing teeth, they’re good for crushing and grinding up your food.

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1. DIFFERENCES BETWEEN PRIMARY AND PERMANENT TEETH

2. CONTENTS THE CROWN THE ROOT THE PULP HISTOLOGIC DIFFERENCES MINERAL CONTENT

3. THE CROWN PRIMARY TEETH PERMANENT TEETH COLOR Bluish white – milky white Because of more opaque enamel –less mineral content Darker in color, grayish or yellowish white- due to translucent enamel –high mineral content- reflect colour of the dentin DURATION 6 mo – 5 ½ years From 6 years onwards No. of teeth 20 2 incisors, 1 canine, 2 molars in each quadrant 32 2 incisors, 1 canine, 2 premolars, 3 molars in each quadrant

4. THE CROWN PRIMARY TEETH PERMANENT TEETH Interdental spacing Natural spacing exists less or no spacing Orientation Primary incisors- upright orientation. Labially inclined Size Smaller Deciduous molar – larger than their successors( premolars ) Second molars are larger than first molar Larger First molars are larger than second molars

5. PRIMARY TEETH PERMANENT TEETH DIMENSION More bulbous Wider mesio distal dimension compared to cervico occlusal height Anterior teeth - Cup shape Squat shape – molars Less bulbous Cervico occlusal height is larger compared to mesio distal dimension – anterior teeth

6. PRIMARY TEETH PERMANENT TEETH CUSP More pointed Less sharper Cervical ridges More prononunced Buccal aspect of first primary molar Flatter Occlusal plane Flat & occlusal table-narrow Contours & & occlusal table- broad Enamel Thinner – 1mm Thicker – 2-3 mm Contact area Broader, flatter situated gingivally occlusally

7. PRIMARY TEETH PERMANENT TEETH Enamel rods Slopes occlusally from DEJ Gingivally Supplemental grooves More Less Mammelons Absent Erupted - incisors

8. THE ROOT PRIMARY TEETH PERMANENT TEETH ROOT Larger and more slender flared Shorter and bulbous Absence of flaring FURCATION More towars cervical area Apical MESIODISTAL Narrow Broader PHYSIOLOGIC RESORPTION Present Absent

9. THE PULP PRIMARY TEETH PERMANENT TEETH PULP CHAMBER Larger in relation to crown size Ribbon like Smaller in relation to crown size Well defined Pulpal outline Follows DEJ more closely AFollows DEJ less closely PULP HORN Closer to occlusal surface Comparatively away from surface Cellularity and vascularity High Less

10. PRIMARY TEETH PERMANENT TEETH Apical foramen Enlarged apical foramen Increased vascularity Typical inflammatory respose Restricted forameen Reduced blood supply Calcific response Reparative dentin Extensive and more irregular Less Density of innervation Less More

11. MINERAL CONTENT PRIMARY TEETH PERMANENT TEETH Enamel and dentin Less mineralised Inorganic content - less More Bands of Retzius Less common Bluish white color - teeth More common Neonatal lines Present Only in 1 st permanent molar Interglobular dentin Absent Present Cementum Thin and primary type Secondary type - absent Seconadary cementum – present

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